705278129 has 2 divisors, whose sum is σ = 705278130. Its totient is φ = 705278128.

The previous prime is 705278111. The next prime is 705278137. The reversal of 705278129 is 921872507.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 545129104 + 160149025 = 23348^2 + 12655^2 .

It is an emirp because it is prime and its reverse (921872507) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 705278129 - 2¹² = 705274033 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (705278149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352639064 + 352639065.

It is an arithmetic number, because the mean of its divisors is an integer number (352639065).

Almost surely, 2^705278129 is an apocalyptic number.

It is an amenable number.

705278129 is a deficient number, since it is larger than the sum of its proper divisors (1).

705278129 is an equidigital number, since it uses as much as digits as its factorization.

705278129 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 41.

The square root of 705278129 is about 26557.0730503194. The cubic root of 705278129 is about 890.1300693627.

The spelling of 705278129 in words is "seven hundred five million, two hundred seventy-eight thousand, one hundred twenty-nine".